单项选择题

A．They are doing experiments.
B．They are listening to the lecture.
C．They are debating.
D．They are giving and listening to presentations.
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单项选择题
A．Customer and waiter.B．Customer and salesman.C．Passenger and taxi-driver.D．Passenger and steward.
A．Customer and waiter.
B．Customer and salesman.
C．Passenger and taxi-driver.
D．Passenger and steward.
单项选择题
A．To Beijing for a class reunion.B．To Beijing on vacation.C．To Beijing on business.D．To Beijing to visit his relatives.
A．To Beijing for a class reunion.
B．To Beijing on vacation.
C．To Beijing on business.
D．To Beijing to visit his relatives.
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